Light stops, blind spots, and isospin violation in the MSSM

Crivellin, Andreas (CERN Theory Division, CH-1211, Geneva 23, Switzerland) (Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland) ; Hoferichter, Martin (Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland) (Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 2, D-64289, Darmstadt, Germany) (ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291, Darmstadt, Germany) ; Procura, Massimiliano (Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland) (Fakultät für Physik, Universität Wien, Boltzmanngasse 5, A-1090, Vienna, Austria) ; Tunstall, Lewis (Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland)

25 July 2015

Abstract: In the framework of the MSSM, we examine several simplified models where only a few superpartners are light. This allows us to study WIMP-nucleus scattering in terms of a handful of MSSM parameters and thereby scrutinize their impact on dark matter direct-detection experiments. Focusing on spin-independent WIMP-nucleon scattering, we derive simplified, analytic expressions for the Wilson coefficients associated with Higgs and squark exchange. We utilize these results to study the complementarity of constraints due to direct-detection, flavor, and collider experiments. We also identify parameter configurations that produce (almost) vanishing cross sections. In the proximity of these so-called blind spots, we find that the amount of isospin violation may be much larger than typically expected in the MSSM. This feature is a generic property of parameter regions where cross sections are suppressed, and highlights the importance of a careful analysis of the nucleon matrix elements and the associated hadronic uncertainties. This becomes especially relevant once the increased sensitivity of future direct-detection experiments corners the MSSM into these regions of parameter space.


Published in: JHEP 1507 (2015) 129
Published by: Springer/SISSA
DOI: 10.1007/JHEP07(2015)129
arXiv: 1503.03478
License: CC-BY-4.0



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